کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7712733 | 1497423 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The electrochemical hydrogen storage performances of MgxCo100-x (x = 40, 45, 50, 55, 60, 63) body-centered cubic alloys and their Pd-doped system
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
In this work, a serial of Mg-Co binary alloys with body-centered cubic (BCC) phase were prepared for anode materials of Ni-MH hydrogen storage battery system. TEM/SAED analyses on binary Mg-Co alloys demonstrated that their grains were all in nano-size (â¼5 nm) with BCC structure. Electrochemical tests found that, with increase of the concentration of Mg in alloys, theoretical charge-discharge capacities would increase accordingly, discharge kinetics (exchange current densities and hydrogen diffusion abilities) were improved as well. However, the tested capacity will attain a maximum value (325 mAh gâ1) at the point of Mg55Co45 and deteriorate subsequently with continuous increase of Mg content, which was possibly due to the optimized lattice parameter value and Mg corrosion. The increase of Co concentration in the binary alloys effectively inhibited the corrosion of the electrodes. On the basis of Mg-Co binary alloys, the Pd-doped ternary alloys with BCC structure were also prepared by means of ball milling. These alloys possess greatly enhanced discharge capacities (280-500 mAh gâ1) from binary ones. It shows that with increase of the Mg content, the discharge capacities of Mg-Co-Pd ternary alloys will increase monotonously. The additional Pd also improved cycle stabilities, kinetics, and corrosion potentials of the alloys, which was beneficial to improving the properties of Mg-Co hydrogen storage electrodes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 41, Issue 2, 12 January 2016, Pages 1089-1097
Journal: International Journal of Hydrogen Energy - Volume 41, Issue 2, 12 January 2016, Pages 1089-1097
نویسندگان
Yao Zhang, Leyu Zhan, Xiangyang Zhuang, Yunfeng Zhu, Yi Qu, Jian Chen, Xinli Guo, Neng Wan, Liquan Li,